> Source: [sk185130](https://support.checkpoint.com/results/sk/sk185130)

# sk185130 - Azure unregister_netdevice error during SR-IOV interface rescan

| Property | Value |
|----------|-------|
| Solution ID | sk185130 |
| Date Created | 2026-07-08 |
| Last Modified | 2026-11-12 |
| Technical Level | General |
| Products | Cloud Firewall |
| Versions | R82.10 |
| OS | Gaia |

## Symptoms

- * The following error is written to `/var/log/messages` every 10 seconds and is continuously displayed when connecting to the gateway via SSH or the serial console:   
  `unregister_netdevice: waiting for enP... to become free. Usage count = 3`
* When this error occurs, the VM hangs during reboot and requires a hard restart from the Azure portal.
* In some cases, the Cloud Firewall Gateway becomes unresponsive following a Jumbo Hotfix Accumulator installation. The reboot begins but does not complete, causing the VM to hang. Recovery requires a hard restart from the Azure portal.
* In rare cases, the USIM process may crash, generating a core dump and causing the Cloud Firewall Gateway to reboot. If the gateway becomes unreachable, recovery requires a manual hard restart from the Azure portal.

## Cause

After an Azure-triggered SR-IOV hot-unplug event, an issue in the unregister and rescan flow causes incomplete network device cleanup. This results in the repeated `unregister_netdevice` errors.

## Solution

This problem was fixed. The fix is included in:

* [Jumbo Hotfix Accumulator for R82.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R82.20/index.html) starting from Take 14
* [Jumbo Hotfix Accumulator for R82.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R82.10/Default.htm) starting from Take 52

If you choose not to upgrade, Check Point can supply a **Hotfix** . [Contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for this issue.  
A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.  
For faster resolution and verification, please collect [CPinfo files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

**Hotfix installation instructions:**   
Refer to [sk168597 - How to install a Hotfix](https://support.checkpoint.com/results/sk/sk168597).

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